Anti-vaccine protesters have attempted to storm the BBC's Television Centre in White City, west London.
Video shared online shows a mob of demonstrators attempting to enter the building in Shepherd’s Bush amid a heavy police presence.
Footage shared on YouTube showed scores of people gathered in a London park.
After a short while, the demonstrators can be seen exiting the park followed by a number of police officers.
One man in the crowd can be heard saying: "It might be going towards the BBC...it looks like we're going to White City guys".
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People can then be heard cheering and whistling as the crowd goes on to a road.
The crowd then makes its way to the BBC Studio in White City where it is met by a heavy police presence.
Demonstraters try to force their way into the building but are pushed back by police.
A Met Police spokesperson said: “We are aware of a group of demonstrators who, having set off from Shepherds Bush Green shortly after 13:00hrs, are now gathered outside commercial premises in Wood Lane, White City.
“There have been no arrests but officers are in attendance and will continue to monitor the situation.”
A BBC spokesperson said the corporation does not comment on security matters.
Outside the BBC studio, the crowd begins to shout "shame on you, shame on you" and a man gave a speech, accusing the corporation of “not giving out the right information” and claiming they’re “coming for our f****** children.”